155400442 has 8 divisors (see below), whose sum is σ = 234644832. Its totient is φ = 77185500.

The previous prime is 155400437. The next prime is 155400457. The reversal of 155400442 is 244004551.

It is a happy number.

155400442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256984 + ... + 257587.

It is an arithmetic number, because the mean of its divisors is an integer number (29330604).

Almost surely, 2^155400442 is an apocalyptic number.

155400442 is a deficient number, since it is larger than the sum of its proper divisors (79244390).

155400442 is a wasteful number, since it uses less digits than its factorization.

155400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514724.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 155400442 is about 12465.9713620720. The cubic root of 155400442 is about 537.6307287573.

Adding to 155400442 its reverse (244004551), we get a palindrome (399404993).

The spelling of 155400442 in words is "one hundred fifty-five million, four hundred thousand, four hundred forty-two".